 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.editors.text;

 import org.eclipse.core.filesystem.EFS;
 import org.eclipse.core.filesystem.IFileStore;

 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.Path;
 import org.eclipse.core.runtime.Platform;

 import org.eclipse.core.resources.IStorage;

 import org.eclipse.jface.resource.ImageDescriptor;

 import org.eclipse.jface.text.Assert;

 import org.eclipse.ui.editors.text.ILocationProvider;

 import org.eclipse.ui.IPathEditorInput;
 import org.eclipse.ui.IPersistableElement;
 import org.eclipse.ui.IStorageEditorInput;
 import org.eclipse.ui.model.IWorkbenchAdapter;

 /**
  * @since 3.0
  */
 public class JavaFileEditorInput implements IPathEditorInput, IStorageEditorInput, ILocationProvider {

     /**
      * The workbench adapter which simply provides the label.
      *
      * @since 3.1
      */
     private class WorkbenchAdapter implements IWorkbenchAdapter {
         /*
          * @see org.eclipse.ui.model.IWorkbenchAdapter#getChildren(java.lang.Object)
          */
         public Object [] getChildren(Object o) {
             return null;
         }

         /*
          * @see org.eclipse.ui.model.IWorkbenchAdapter#getImageDescriptor(java.lang.Object)
          */
         public ImageDescriptor getImageDescriptor(Object object) {
             return null;
         }

         /*
          * @see org.eclipse.ui.model.IWorkbenchAdapter#getLabel(java.lang.Object)
          */
         public String getLabel(Object o) {
             return ((JavaFileEditorInput)o).getName();
         }

         /*
          * @see org.eclipse.ui.model.IWorkbenchAdapter#getParent(java.lang.Object)
          */
         public Object getParent(Object o) {
             return null;
         }
     }

     private IFileStore fFileStore;
     private WorkbenchAdapter fWorkbenchAdapter= new WorkbenchAdapter();
     private IStorage fStorage;
     private IPath fPath;
     
     public JavaFileEditorInput(IFileStore fileStore) {
         Assert.isNotNull(fileStore);
         Assert.isTrue(EFS.SCHEME_FILE.equals(fileStore.getFileSystem().getScheme()));
         fFileStore= fileStore;
         fWorkbenchAdapter= new WorkbenchAdapter();
     }
     /*
      * @see org.eclipse.ui.IEditorInput#exists()
      */
     public boolean exists() {
         return fFileStore.fetchInfo().exists();
     }

     /*
      * @see org.eclipse.ui.IEditorInput#getImageDescriptor()
      */
     public ImageDescriptor getImageDescriptor() {
         return null;
     }

     /*
      * @see org.eclipse.ui.IEditorInput#getName()
      */
     public String getName() {
         return fFileStore.getName();
     }

     /*
      * @see org.eclipse.ui.IEditorInput#getPersistable()
      */
     public IPersistableElement getPersistable() {
         return null;
     }

     /*
      * @see org.eclipse.ui.IEditorInput#getToolTipText()
      */
     public String getToolTipText() {
         return fFileStore.toString();
     }

     /*
      * @see org.eclipse.core.runtime.IAdaptable#getAdapter(java.lang.Class)
      */
     public Object getAdapter(Class adapter) {
         if (ILocationProvider.class.equals(adapter))
             return this;
         if (IWorkbenchAdapter.class.equals(adapter))
             return fWorkbenchAdapter;
         return Platform.getAdapterManager().getAdapter(this, adapter);
     }

     /*
      * @see org.eclipse.ui.editors.text.ILocationProvider#getPath(java.lang.Object)
      */
     public IPath getPath(Object element) {
         if (element instanceof JavaFileEditorInput)
             return ((JavaFileEditorInput)element).getPath();
         
         return null;
     }

     /*
      * @see org.eclipse.ui.IPathEditorInput#getPath()
      * @since 3.1
      */
     public IPath getPath() {
         if (fPath == null)
             fPath= new Path(fFileStore.toURI().getPath());
         return fPath;
     }

     /*
      * @see java.lang.Object#equals(java.lang.Object)
      */
     public boolean equals(Object o) {
         if (o == this)
             return true;

         if (o instanceof JavaFileEditorInput) {
             JavaFileEditorInput input= (JavaFileEditorInput) o;
             return fFileStore.equals(input.fFileStore);
         }

         if (o instanceof IPathEditorInput) {
             IPathEditorInput input= (IPathEditorInput)o;
             return getPath().equals(input.getPath());
         }

         return false;
     }

     /*
      * @see java.lang.Object#hashCode()
      */
     public int hashCode() {
         return fFileStore.hashCode();
     }

     /*
      * @see org.eclipse.ui.IStorageEditorInput#getStorage()
      * @since 3.2
      */
     public IStorage getStorage() throws CoreException {
         if (fStorage == null)
             fStorage= new JavaFileStorage(fFileStore);
         return fStorage;
     }

 }

